Hi, On Thu, Apr 4, 2019 at 9:26 PM Maxime Ripard <maxime.ripard@xxxxxxxxxxx> wrote: > > From: Pawel Osciak <posciak@xxxxxxxxxxxx> > > Stateless video codecs will require both the H264 metadata and slices in > order to be able to decode frames. > > This introduces the definitions for a new pixel format for H264 slices that > have been parsed, as well as the structures used to pass the metadata from > the userspace to the kernel. > > Reviewed-by: Tomasz Figa <tfiga@xxxxxxxxxxxx> > Signed-off-by: Pawel Osciak <posciak@xxxxxxxxxxxx> > Signed-off-by: Guenter Roeck <groeck@xxxxxxxxxxxx> > Co-developed-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx> > Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxx> > --- > Documentation/media/uapi/v4l/biblio.rst | 9 +- > Documentation/media/uapi/v4l/ext-ctrls-codec.rst | 569 ++++++++++++++- > Documentation/media/uapi/v4l/pixfmt-compressed.rst | 19 +- > Documentation/media/uapi/v4l/vidioc-queryctrl.rst | 30 +- > Documentation/media/videodev2.h.rst.exceptions | 5 +- > drivers/media/v4l2-core/v4l2-ctrls.c | 42 +- > drivers/media/v4l2-core/v4l2-ioctl.c | 1 +- > include/media/h264-ctrls.h | 192 +++++- > include/media/v4l2-ctrls.h | 13 +- > include/uapi/linux/videodev2.h | 1 +- > 10 files changed, 880 insertions(+), 1 deletion(-) > create mode 100644 include/media/h264-ctrls.h > > diff --git a/Documentation/media/uapi/v4l/biblio.rst b/Documentation/media/uapi/v4l/biblio.rst > index ec33768c055e..8f4eb8823d82 100644 > --- a/Documentation/media/uapi/v4l/biblio.rst > +++ b/Documentation/media/uapi/v4l/biblio.rst > @@ -122,6 +122,15 @@ ITU BT.1119 > > :author: International Telecommunication Union (http://www.itu.ch) > > +.. _h264: > + > +ITU-T Rec. H.264 Specification (04/2017 Edition) > +================================================ > + > +:title: ITU-T Recommendation H.264 "Advanced Video Coding for Generic Audiovisual Services" > + > +:author: International Telecommunication Union (http://www.itu.ch) > + > .. _jfif: > > JFIF > diff --git a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst > index 67a122339c0e..1285bfec7d3d 100644 > --- a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst > +++ b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst > @@ -1371,6 +1371,575 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type - > - Layer number > > > +.. _v4l2-mpeg-h264: > + > +``V4L2_CID_MPEG_VIDEO_H264_SPS (struct)`` > + Specifies the sequence parameter set (as extracted from the > + bitstream) for the associated H264 slice data. This includes the > + necessary parameters for configuring a stateless hardware decoding > + pipeline for H264. The bitstream parameters are defined according > + to :ref:`h264`, section 7.4.2.1.1 "Sequence Parameter Set Data > + Semantics". For further documentation, refer to the above > + specification, unless there is an explicit comment stating > + otherwise. > + > + .. note:: > + > + This compound control is not yet part of the public kernel API and > + it is expected to change. > + > +.. c:type:: v4l2_ctrl_h264_sps > + > +.. cssclass:: longtable > + > +.. flat-table:: struct v4l2_ctrl_h264_sps > + :header-rows: 0 > + :stub-columns: 0 > + :widths: 1 1 2 > + > + * - __u8 > + - ``profile_idc`` > + - > + * - __u8 > + - ``constraint_set_flags`` > + - See :ref:`Sequence Parameter Set Constraints Set Flags <h264_sps_constraints_set_flags>` > + * - __u8 > + - ``level_idc`` > + - > + * - __u8 > + - ``seq_parameter_set_id`` > + - > + * - __u8 > + - ``chroma_format_idc`` > + - > + * - __u8 > + - ``bit_depth_luma_minus8`` > + - > + * - __u8 > + - ``bit_depth_chroma_minus8`` > + - > + * - __u8 > + - ``log2_max_frame_num_minus4`` > + - > + * - __u8 > + - ``pic_order_cnt_type`` > + - > + * - __u8 > + - ``log2_max_pic_order_cnt_lsb_minus4`` > + - > + * - __u8 > + - ``max_num_ref_frames`` > + - > + * - __u8 > + - ``num_ref_frames_in_pic_order_cnt_cycle`` > + - > + * - __s32 > + - ``offset_for_ref_frame[255]`` > + - > + * - __s32 > + - ``offset_for_non_ref_pic`` > + - > + * - __s32 > + - ``offset_for_top_to_bottom_field`` > + - > + * - __u16 > + - ``pic_width_in_mbs_minus1`` > + - > + * - __u16 > + - ``pic_height_in_map_units_minus1`` > + - We recently had some reflection with Alex that this is redundant with the width and height in the OUTPUT format. It may also apply to some other fields in these structs. I feel like they should be removed and passed via corresponding generic V4L2 properties - format, selection, etc. The same problem is also present in the MPEG2 controls. In fact, there was a patch already which used some fields from the controls to calculate the destination buffer strides, rather than bytesperline in the format. Since we're in staging, it could be done with a follow-up patch, though. Best regards, Tomasz
